题目内容

下面各题怎样简便怎样算(求未知数X).
4.02-1.36-2.64(1-
6
7
)÷
7
3
×
3
7
5
14
+(
9
14
-
4
9
)
X:
3
4
=
2
5
:
10
3
(
3
4
÷3-0.2)×
1
25
.

(1)4.02-1.36-2.64,
=4.02-(1.36+2.64),
=4.02-4,
=0.02;

(2)(1-
6
7
)÷
7
3
×
3
7
,
=
1
7
÷
7
3
×
3
7
,
=
1
7
×
3
7
×
3
7
,
=
9
343
;

(3)
5
14
+(
9
14
-
4
9
)
,
=
5
14
+
9
14
-
4
9
,
=1-
4
9
,
=
5
9
;

(4)X:
3
4
=
2
5
:
10
3
,
10
3
X=
3
4
×
2
5
,
10
3
X=
3
10
,
10
3
X÷
10
3
=
3
10
÷
10
3
,
X=
9
100
;

(5)(
3
4
÷3-0.2)×
1
25
,
=(
1
4
-0.2)×
1
25
,
=0.05×
1
25
,
=0.002.
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